4.7 Servo Control
(6) Driver circuit
The driver circuit is a power amplitude circuit that receives signals from the
spindle motor control circuit and feeds currents to the spindle motor.
(7) VCM current sense resistor (CSR)
This resistor controls current at the power amplifier by converting the VCM
current into voltage and feeding back.
4.7.2 Data-surface servo format
Figure 4.7 describes the physical layout of the servo frame. The three areas
indicated by (1) to (3) in Figure 4.7 are described below.
(1) Inner guard band
This area is located inside the user area, and the rotational speed of the VCM can
be controlled on this cylinder area for head moving.
(2) Data area
This area is used as the user data area and SA area.
(3) Outer guard band
This area is located at outer position of the user data area, and the rotational speed
of the spindle can be controlled on this cylinder area for head moving.
C141-E245
4-15
Summary of Contents for MHW2040BH - Mobile 40 GB Hard Drive
Page 4: ...This page is intentionally left blank ...
Page 8: ...This page is intentionally left blank ...
Page 10: ...This page is intentionally left blank ...
Page 12: ...This page is intentionally left blank ...
Page 42: ...This page is intentionally left blank ...
Page 54: ...This page is intentionally left blank ...
Page 74: ...This page is intentionally left blank ...
Page 256: ...This page is intentionally left blank ...
Page 278: ...This page is intentionally left blank ...
Page 282: ...This page is intentionally left blank ...
Page 284: ...This page is intentionally left blank ...
Page 292: ...This page is intentionally left blank ...
Page 294: ......
Page 295: ......
Page 296: ......